3CE50EC8.BC3F19C1@gmx.de...
> It should be mentioned that Gilles' code does not use the classical
> 'hf-style' function which would have constant gradient in vertical
> direction:
> function {y-f_ridged_mf( x, 0, z, ...

In fact, the height_field example can also be simplified as the z coordinate
is not used.
height_field {
      function 100,100 {
        f_ridged_mf( x, y, 0, 1, 2, 9, -0.5, 3,3 )*0.5
      }
}

G.
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